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Volume 47, No. 1 ![]() Volumes > 38 (2010-->) Volumes 28-37 (2000-09) Volumes 18-27 (1990-99) Volumes 5-17 (1978-89) a.k.a. Cormorant Quick Search by author or article title:
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Key words: Antarctica, seabirds, adoption, fostered chicks, twin chicks, coloniality, supra-normal clutches Abstract In 2017/18, we recorded multiple instances of Adelie Penguin Pygoscelis adeliae nests containing three chicks at Cape Crozier, Ross Island, Antarctica. In one sub-colony, 0.67 % of nests had three chicks, or two chicks and one egg. We found that some Adelie Penguin pairs were willing to brood three chicks, as well as chicks that were not their own. Many factors could lead to supra-normal clutches and broods, including foreign eggs added to a nest, adoption of chicks belonging to other parents, and double-yolked eggs. In order to understand the true cost of colonial breeding in large Adelie Penguin colonies and to assess the source of chicks or eggs in supra-normal clutches and broods, we conclude that future studies should examine the frequency of supra-normal clutches and broods and analyze the genetics of chicks within sub-colonies. 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